Where Are They Now? 'Buffy the Vampire Slayer'

In 2000, the former "Harriet the Spy" star joined "Buffy the Vampire Slayer" as the title character's never previously mentioned kid sister, Dawn. (Where did she come from? Magic. No, really. That was the explanation given. But because it was "Buffy," it made sense.) Trachtenberg literally grew into a young woman on the show. and has since enjoyed a successful career...